CN108767868A - Low-voltage circuit on-load voltage regulation compensation device - Google Patents
Low-voltage circuit on-load voltage regulation compensation device Download PDFInfo
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- CN108767868A CN108767868A CN201810615873.1A CN201810615873A CN108767868A CN 108767868 A CN108767868 A CN 108767868A CN 201810615873 A CN201810615873 A CN 201810615873A CN 108767868 A CN108767868 A CN 108767868A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
A kind of low-voltage circuit on-load voltage regulation compensation device is claimed in the present invention comprising：Voltage input end, voltage output end, for carrying out terminal voltage adjusting by electromagnetic voltage adjusting or passing through the terminal voltage regulating circuit of voltage compensation, the terminal voltage regulating circuit is set between voltage input end and voltage output end, when detecting the voltage of voltage input end or voltage output end less than setting acceptance value, by adjusting voltage and compensating reactive power electric current, that realizes voltage output end stablizes output.Apparatus of the present invention can compensate low-voltage circuit terminal voltage with fast and stable.
Description
Technical field
The invention belongs to reactive-load compensation fields, more particularly to low-voltage circuit on-load voltage regulation compensation device.
Background technology
With the continuous development of society, Living consumption is continuously improved, new electric appliance, such as air-conditioning, electromagnetic stove, laundry
The household electrical appliance such as the electronic equipments such as machine, refrigerator, electric heater, television set, computer, duplicator and electric cooking appliance constantly enter into family,
These electric appliances may be collectively referred to as the end load of low-voltage circuit, big due to wherein existing when alternating current by these when being loaded
Inductive load is measured, inductance is contained in inductive load, inductance can carry out periodically charging and putting in the line between substation
Electricity, in theory substation how many electricity filled to inductance, how many electricity also put to substation for inductance, and inductance will not disappear in power network line
Consuming electric power, so its power in the line is also referred to as reactive power, but actually since circuit has certain resistance, electricity
The electric current for the charge and discharge that sense generates in the line can increase circuit and generate heat, the increase of reactive loss, the decline of power factor,
The voltage of circuit also reduced, this causes power quality to reduce, and then influence the normal operation of user power utilization equipment, when serious
Electrical equipment can be caused to damage, loss is brought to user；Also can make the electrical equipments such as transformer, electronic component added losses and
Fever leads to accelerated ageing of insulating, shortens the working life.In order to improve the running quality of electrical equipment, it is often necessary to give electricity consumption
Equipment carries out reactive-load compensation.
For this present situation, Traditional solutions are to expand transformer capacity or from surrounding area increase to adjust electric energy to supply electricity
Notch is pressed, this undoubtedly increases the cost of investment, while the phenomenon that also will appear low load with strong power in the winter of low power consumption, making
At serious waste.In addition it can also attempt to reduce the flowing of the electric current of the charge and discharge of this inductive load on the line.Capacitor
It is also a kind of wattless component in power network line, can be also carried out between substation periodically in power network line as inductance
Charge and discharge, so electric energy will not be consumed in the line, but in the same circuit capacitor charge and discharge
Time and inductance it is exactly the opposite, that is to say, that in induction charging, capacitance discharges, conversely, inductance capacitance in electric discharge is filling
Electricity, so the method for reactive-load compensation is capacitor (the most short original in reactive-load compensation path of the parallel connection respective volume near inductive load
Then) so that the originally charge and discharge behavior change between inductance and substation is to be carried out between inductance and capacitor, offsets or subtracts
The reactive current generated in few circuit between inductance and substation, here it is the brief principles for the reactive-load compensation often said.
Invention content
Present invention seek to address that the above problem of the prior art.It is proposed a kind of accurate stable carries out reactive-load compensation to voltage
Low-voltage circuit on-load voltage regulation compensation device.
Technical scheme is as follows：
Low-voltage circuit on-load voltage regulation compensation device comprising：Voltage input end, voltage output end, for by electromagnetic voltage adjusting into
The adjusting of row terminal voltage or the terminal voltage regulating circuit by voltage compensation, when power factor is less than 0.98 and voltage is less than
Using voltage compensation when 198V, power factor is higher than 0.98 or compensating electric capacity uses electricity when all input and voltage are less than 198V
Magnetic pressure regulation, the terminal voltage regulating circuit are set between voltage input end and voltage output end, when detecting control source
When the voltage of end or voltage output end is less than setting acceptance value, by adjusting voltage and compensating reactive power electric current, realize that voltage is defeated
Outlet stablizes output.
Further, when carrying out terminal voltage adjusting using electromagnetic voltage adjusting, the terminal voltage regulating circuit includes opening
Changing device deeply concerned, harmonic protection device, power factor controller, capacitor switching switch, capacitor, current transformer, exchange connect
Tentaculum, transformer, first fuse, second fuse, power factor controller and voltage and current controller, the control source
End is connected by switching device with harmonic protection device, and the forward end of the harmonic protection device is all the way directly and voltage and current
Controller is connected, and another way is connected after current transformer with voltage and current controller, and voltage output end is direct all the way
It is connected with voltage and current controller, another way is connected after current transformer with voltage and current controller；The harmonic wave
The negative end of protector is connected by first fuse FU1 with 12 ports of power factor controller, 8 ports all the way, all the way
It is connected with the N-terminal of capacitor switching switch, 14 interface of output at the ends C+ and power factor controller of capacitor switching switch
It is connected, the ends CC- are connected with 15 interface of output of power factor controller, the output 16 of the ends CB- and power factor controller
Interface is connected, and the ends CA- are connected with 17 interface of output of power factor controller, mono- tunnels second fuse FU2 and power because
22 interface of output of plain controller be connected, be connected all the way with 13 interface of the output of power factor controller, all the way also with
Indicator light is connected, and the another road of negative end of harmonic controller is connected by switching with transformer, and with voltage output end phase
Connection.
Further, the switching device uses HD11-100/28 knife-like switches, the harmonic protection device to use
MXBY-2/40KA model harmonic protection devices, the power factor controller use MRVC-N/D, the capacitor switching switch to adopt
Use MJC-45F/D.
Further, when carrying out terminal voltage adjusting using voltage compensation, terminal voltage regulating circuit includes：Power because
Plain controller, harmonic protection device, capacitor switching switch, capacitor switching switch controller, capacitor and breaker, the electricity
Pressure input terminal be connected all the way with harmonic protection device by breaker, all the way with capacitor switching switch be connected after with capacitor
Be connected, another road is connected with the sample point of power factor controller crimping mouth, operating voltage interface respectively, the power because
The interface of plain controller includes sampling voltage interface, sampling current interface, operating voltage interface, controller output interface and GPRS
Interface, the 14-16 interfaces of the controller output interface respectively with the ports C+ of capacitor switching switch controller, the ports CA-,
The ports CB- are connected, the ports CC- of capacitor switching switch controller be connected with N-port after with controller output interface
17 interfaces are connected, and the output end of capacitor switching switch controller switchs phase by cutting indicator light thoroughly with capacitor switching all the way
It connects and carries out switching control, be connected all the way with fuse by power supply indicator.
Further, the fuse uses RT18-32/5A, the power factor controller to use MRVC-N/DG, institute
Stating harmonic protection device uses MXBY-2/40KA, the capacitor switching switch to use MJD-45F/3, capacitor switching switch control
Device processed, capacitor MXBY-2/40KA.
The beneficial effects of the invention are as follows it is innovative be combined using electromagnetic voltage adjusting and voltage pressure regulation by way of come pair
Terminal voltage compensates, and voltage compensation, power factor is used to be higher than when power factor is less than 0.98 and voltage is less than 198V
0.98 or compensating electric capacity all input and voltage be less than 198V when use electromagnetic voltage adjusting, can with it is stable and accurate to low-pressure end into
Row control, and separately designed electromagnetic voltage adjusting device and voltage regulator and carried out voltage compensation, when detecting control source
When the voltage of end or voltage output end is less than setting acceptance value, by adjusting voltage and compensating reactive power electric current, realize that voltage is defeated
Outlet stablizes output so that reactive-load compensation is more accurate, more energy efficient, reduces electric energy caused by the fever of electric current on circuit and damages
It loses.
Description of the drawings
Fig. 1 is the circuit diagram that the present invention provides that preferred embodiment electromagnetic voltage adjusting carries out terminal voltage adjusting；
Fig. 2 is the circuit diagram of voltage compensation；
Fig. 3 is transformer schematic diagram.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, detailed
Carefully describe.Described embodiment is only a part of the embodiment of the present invention.
The present invention solve above-mentioned technical problem technical solution be：
A kind of low-voltage circuit on-load voltage regulation compensation device, including：Voltage input end, voltage output end, for passing through electromagnetic voltage adjusting
It carries out terminal voltage adjusting or the terminal voltage regulating circuit by voltage compensation, the terminal voltage regulating circuit is set to
Between voltage input end and voltage output end, acceptance value is set when detecting that the voltage of voltage input end or voltage output end is less than
When, by adjusting voltage and compensating reactive power electric current, that realizes voltage output end stablizes output.
As shown in Figure 1, when carrying out terminal voltage adjusting using electromagnetic voltage adjusting, the terminal voltage regulating circuit includes opening
Changing device deeply concerned, harmonic protection device, power factor controller, capacitor switching switch, capacitor, current transformer, exchange connect
Tentaculum, transformer, first fuse, second fuse, power factor controller and voltage and current controller, the control source
End is connected by switching device with harmonic protection device, and the forward end of the harmonic protection device is all the way directly and voltage and current
Controller is connected, and another way is connected after current transformer with voltage and current controller, and voltage output end is direct all the way
It is connected with voltage and current controller, another way is connected after current transformer with voltage and current controller；The harmonic wave
The negative end of protector is connected by first fuse FU1 with 12 ports of power factor controller, 8 ports all the way, all the way
It is connected with the N-terminal of capacitor switching switch, 14 interface of output at the ends C+ and power factor controller of capacitor switching switch
It is connected, the ends CC- are connected with 15 interface of output of power factor controller, the output 16 of the ends CB- and power factor controller
Interface is connected, and the ends CA- are connected with 17 interface of output of power factor controller, mono- tunnels second fuse FU2 and power because
22 interface of output of plain controller be connected, be connected all the way with 13 interface of the output of power factor controller, all the way also with
Indicator light is connected, and the another road of negative end of harmonic controller is connected by switching with transformer, and Fig. 3 show transformer knot
Structure schematic diagram, and be connected with voltage output end.
Switching device uses HD11-100/28 knife-like switches, harmonic protection device to be protected using MXBY-2/40KA model harmonic waves
Device is protected, the power factor controller uses MRVC-N/D, capacitor switching switch to use MJC-45F/D.
As shown in Fig. 2, when carrying out terminal voltage adjusting using voltage compensation, terminal voltage regulating circuit includes：Power
It is Factor Controller, harmonic protection device, capacitor switching switch, capacitor switching switch controller, capacitor and breaker, described
Voltage input end is connected with harmonic protection device all the way by breaker, all the way with capacitor switching switch be connected after with capacitance
Device is connected, and another road is connected with the sample point of power factor controller crimping mouth, operating voltage interface respectively, the power
The interface of Factor Controller include sampling voltage interface, sampling current interface, operating voltage interface, controller output interface and
GPRS interfaces, the 14-16 interfaces of the controller output interface respectively with the ports C+ of capacitor switching switch controller, CA-
Port, the ports CB- are connected, and the ports CC- of capacitor switching switch controller connect after being connected with N-port with controller output
17 interfaces of mouth are connected, and the output end of capacitor switching switch controller is opened by cutting indicator light thoroughly with capacitor switching all the way
Pass is connected and carries out switching control, is connected all the way with fuse by power supply indicator.
Preferably, fuse uses RT18-32/5A, power factor controller that MRVC-N/DG, harmonic protection device is used to adopt
With MXBY-2/40KA, capacitor switching switch uses MJD-45F/3, capacitor switching switch controller, capacitor MXBY-2/
40KA。
Operation principle of the present invention：By the way that terminal voltage regulating circuit is arranged between voltage input end and voltage output end,
Terminal voltage regulating circuit is used to carry out terminal voltage adjusting by electromagnetic voltage adjusting or by voltage compensation, when power factor is low
In 0.98 and voltage be less than 198V when use voltage compensation, device is as shown in Fig. 2, mainly pass through power factor controller MRVC-
N/D control fling-cut switches are acquired feedback to the voltage of voltage input end and the voltage of voltage output end, and control is adjusted
System, power factor is higher than 0.98 or compensating electric capacity uses electromagnetic voltage adjusting, device such as Fig. 1 when all input and voltage are less than 198V
It is shown, it is mainly combined by power factor controller MRVC-N/D and Current Voltage controller, and controlled by Current Voltage
Device is acquired voltage, the electric current of voltage input end, monitors output current and voltage swing, and pass through power control
The switch of device MRVC-N/D control capacitor fling-cut switchs, control capacitance carries out charge and discharge, into line output voltage adjusting control, end
Voltage regulating circuit is set between voltage input end and voltage output end, when detecting voltage input end or voltage output end
When voltage is less than setting acceptance value, by adjusting voltage and compensating reactive power electric current, that realizes voltage output end stablizes output.
It is the application scenarios in actually quoting below：
When radius of electricity supply is within 1000 meters, quality of voltage requirement can be reached in non-electrical peak period terminal voltage（ 220V
+7%,-10%； 380V ±5%)；And 100% of transformer active load no more than transformer apparent energy, in peak of power consumption
The phase voltage of period is higher than 185V and is less than 198V；Line phase voltage is higher than 342V and is less than 360V；Or the current-carrying capacity base of circuit
This meets the needs of load current；And end load is smaller (to be accounted within the 10% of transformer capacity）；Using the application device
It is adjusted by voltage compensation and low-voltage circuit terminal voltage is compensated.
When radius of electricity supply is within 1000 meters, the active load of transformer is no more than the 100% of transformer apparent energy, line
The current-carrying capacity on road substantially meets load current demand；And end load is larger（Account for 12% or more of transformer capacity）；Non-electrical
Peak period, terminal voltage was between 200-210V；Or radius of electricity supply is within 1000 meters, in non-electrical peak period voltage matter
Amount can reach requirement（ 220V+7%,-10%； 380V ±5%)；Transformer active load is no more than transformer apparent energy
120%；And it is suggested below as one sees fit using originally in the load current of peak of power consumption period 20% beyond line conductor safe carrying capacity
Apply for that device is adjusted by voltage compensation to compensate low-voltage circuit terminal voltage；
When distribution transformer is in 120% or more peak of power consumption period load surcharge；Although or having change platform reactive-load compensation, transformation
Device exit potential is less than normal voltage；Or circuit is more than 1000 meters or more；It is carried in the safety of peak of power consumption period line conductor
Flow is more than the 20% of load current；And it is less than 175V in peak of power consumption period end phase voltage, line voltage is less than 342V;Then not
Low-voltage circuit terminal voltage is compensated it is recommended that being adjusted by voltage compensation using the application device.
By theoretical calculation and each on-the-spot test, load characteristic of the rural subscribers in the peak of power consumption period is:Perception is negative
Carry (air-conditioning, refrigerator, electromagnetic oven）, natural power factor is between 0.68-0.71.If can be obtained in the peak of power consumption period
To good voltage compensation, target power factor cos must be increased within the scope of 0.95-0.99.Therefore it is calculated by this requirement
Penalty coefficient must not be less than 0.72.I.e.：Every kilowatt of active power is compensated according to 72% reactive-load compensation amount, is obtained with this negative
Carry compensation capacity needed for power.
When radius of electricity supply is in 1000 meters or more；It can reach quality of voltage in non-electrical peak period terminal voltage to want
It asks（220V+7%,-10%； 380V ±5%)；And 100% of transformer active load no more than apparent energy, in peak of power consumption
The phase voltage of period is higher than 165V and is less than 198V, and line phase voltage is higher than 342 V and is less than 360V；Or the current-carrying capacity of circuit is basic
Meet load current demand；And end load is smaller（It accounts within the 15% of transformer capacity）；Voltage is passed through using the application device
Compensation and electromagnetic voltage adjusting jointly compensate low-voltage circuit terminal voltage.
When radius of electricity supply is within 1000 meters or more；It can reach quality of voltage in non-electrical peak period terminal voltage
It is required that（220V+7%,-10%； 380V ±5%)；The active load of transformer has been more than the 100% of transformer apparent energy；Circuit
Current-carrying capacity substantially meet the demand of load current, but end load is larger (accounting for 12% of transformer capacity or more), and in electricity consumption
The phase voltage of peak period is higher than 165V but is less than 198V；Line phase voltage is higher than 342V but is less than 360V;Or radius of electricity supply exists
Within 1000 meters or more, requirement can be reached in non-electrical peak period quality of voltage（220V+7%,-10%； 380V ±
5%)；But the active load of transformer alreadys exceed the 100% of capacity, is carried beyond safety in the line load electric current of electric peak period
20% or more of flow；The application device can be suitably used and carry out voltage compensation and electromagnetic voltage adjusting jointly to low-voltage circuit end electricity
Pressure compensation.
When distribution transformer is in 120% or more peak of power consumption period load surcharge；Although or change platform has reactive-load compensation, becomes
Depressor exit potential is less than normal voltage；Or radius of electricity supply is within 1000 meters or more, in peak of power consumption period circuit
Safe carrying capacity is more than 20% or more of load current, and higher than 165V and is less than 198V in the phase voltage of peak of power consumption period；Line
Phase voltage is higher than 342V and is less than 360V;The application device voltage compensation and electromagnetic voltage adjusting should not be used jointly to low-voltage circuit
Terminal voltage compensates.
The capacity of voltage compensation+electromagnetic voltage adjusting compensation is calculated according to apparent energy, and configuration capacity selects in practical applications
It should be greater than the 5% of load capacity.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be in the protection domain being defined in the patent claims.
Claims (5)
1. a kind of low-voltage circuit on-load voltage regulation compensation device, which is characterized in that including：Voltage input end, is used for voltage output end
By electromagnetic voltage adjusting progress terminal voltage adjusting or by the terminal voltage regulating circuit of voltage compensation, when power factor is less than
0.98 and voltage be less than 198V when use voltage compensation, power factor higher than 0.98 or compensating electric capacity all input and voltage it is low
Electromagnetic voltage adjusting, the terminal voltage regulating circuit is used to be set between voltage input end and voltage output end when 198V, when
When detecting that the voltage of voltage input end or voltage output end is less than setting acceptance value, passes through and adjust voltage and compensating reactive power electricity
Stream, that realizes voltage output end stablizes output.
2. low-voltage circuit on-load voltage regulation compensation device according to claim 1, which is characterized in that when using electromagnetic voltage adjusting into
When row terminal voltage is adjusted, the terminal voltage regulating circuit includes switching device, harmonic protection device, power control
Device, capacitor switching switch, capacitor, current transformer, A.C. contactor, transformer, first fuse, second fuse,
Power factor controller and voltage and current controller, the voltage input end are connected by switching device with harmonic protection device
It connects, the forward end of the harmonic protection device is directly connected with voltage and current controller all the way, and another way passes through current transformer
It is connected afterwards with voltage and current controller, voltage output end is directly connected with voltage and current controller all the way, and another way is passed through
It is connected with voltage and current controller after current transformer；The negative end of the harmonic protection device passes through first fuse all the way
FU1 is connected with 12 ports of power factor controller, 8 ports, is connected all the way with the N-terminal of capacitor switching switch, capacitance
The ends C+ of device fling-cut switch are connected with 14 interface of output of power factor controller, the ends CC- and power factor controller it is defeated
Go out 15 interfaces to be connected, the ends CB- are connected with 16 interface of output of power factor controller, the ends CA- and power factor controller
17 interface of output be connected, mono- tunnels second fuse FU2 and 22 interface of output of power factor controller be connected, all the way
It is connected with 13 interface of output of power factor controller, is also connected all the way with indicator light, the negative end of harmonic controller is again
It is connected all the way with transformer by switching, and is connected with voltage output end.
3. low-voltage circuit on-load voltage regulation compensation device according to claim 2, which is characterized in that the switching device
Using HD11-100/28 knife-like switches, the harmonic protection device use MXBY-2/40KA model harmonic protection devices, the power because
Plain controller uses MRVC-N/D, the capacitor switching switch to use MJC-45F/D.
4. low-voltage circuit on-load voltage regulation compensation device according to claim 1, which is characterized in that when using voltage compensation into
When row terminal voltage is adjusted, terminal voltage regulating circuit includes：Power factor controller, harmonic protection device, capacitor switching are opened
Pass, capacitor switching switch controller, capacitor and breaker, the voltage input end by breaker all the way with harmonic protection
Device is connected, and is connected with capacitor after being connected all the way with capacitor switching switch, another road respectively with power control
Sample point crimping mouth, the operating voltage interface of device are connected, the interface of the power factor controller include sampling voltage interface,
Sampling current interface, operating voltage interface, controller output interface and GPRS interfaces, the 14-16 of the controller output interface
Interface is connected with the ports C+ of capacitor switching switch controller, the ports CA-, the ports CB- respectively, capacitor switching switch control
The ports CC- of device processed are connected after being connected with N-port with 17 interfaces of controller output interface, capacitor switching switch control
The output end of device is connected by cutting indicator light and capacitor switching switch thoroughly all the way and carries out switching control, passes through power supply all the way
Indicator light is connected with fuse.
5. low-voltage circuit on-load voltage regulation compensation device according to claim 4, which is characterized in that the fuse uses
RT18-32/5A, the power factor controller use MRVC-N/DG, and the harmonic protection device uses MXBY-2/40KA, described
Capacitor switching switch uses MJD-45F/3, capacitor switching switch controller, capacitor MXBY-2/40KA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810615873.1A CN108767868A (en) | 2018-06-14 | 2018-06-14 | Low-voltage circuit on-load voltage regulation compensation device |
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| CN201810615873.1A CN108767868A (en) | 2018-06-14 | 2018-06-14 | Low-voltage circuit on-load voltage regulation compensation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110739697A (en) * | 2019-10-21 | 2020-01-31 | 广州供电局有限公司 | Low-voltage distribution network low-voltage treatment device and treatment method |
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| CN207234409U (en) * | 2017-10-12 | 2018-04-13 | 山东民生电气设备有限公司 | A kind of low-voltage circuit voltage power-less integrates lifting device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110739697A (en) * | 2019-10-21 | 2020-01-31 | 广州供电局有限公司 | Low-voltage distribution network low-voltage treatment device and treatment method |
| CN110739697B (en) * | 2019-10-21 | 2021-08-10 | 广东电网有限责任公司广州供电局 | Low-voltage distribution network low-voltage treatment device and treatment method |
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